<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8" />
  <meta http-equiv="X-UA-Compatible" content="IE=edge" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  <link rel="stylesheet" href="./css/inputnumber.css" />
  <link rel="stylesheet" href="./css/index.css" />
  <title>购物车</title>
</head>

<body>
  <div class="app-container" id="app">
    <!-- 顶部banner -->
    <div class="banner-box"><img src="http://autumnfish.cn/static/fruit.jpg" alt="" /></div>
    <!-- 面包屑 -->
    <div class="breadcrumb">
      <span>🏠</span>
      /
      <span>购物车</span>
    </div>
    <!-- 购物车主体 -->
    <div class="main">
      <div class="table">
        <!-- 头部 -->
        <div class="thead">
          <div class="tr">
            <div class="th">选中</div>
            <div class="th th-pic">图片</div>
            <div class="th">单价</div>
            <div class="th num-th">个数</div>
            <div class="th">小计</div>
            <div class="th">操作</div>
          </div>
        </div>
        <!-- 身体 -->
        <div class="tbody">

          <!-- 渲染需要的行 -->
          <!-- 
            <div class="tr">
            <div class="td"><input type="checkbox" checked /></div>
            <div class="td"><img src="http://autumnfish.cn/static/火龙果.png" alt="" /></div>
            <div class="td">6</div>
            <div class="td">
              <div class="my-input-number">
                <button class="decrease"> - </button>
                <span class="my-input__inner">2</span>
                <button class="increase"> + </button>
              </div>
            </div>
            <div class="td">12</div>
            <div class="td"><button class="del">删除</button></div>
          </div> 
        -->

        </div>
      </div>
      <!-- 底部 -->
      <div class="bottom">
        <!-- 全选 -->
        <label class="check-all">
          <input type="checkbox" />
          全选
        </label>
        <div class="right-box">
          <!-- 所有商品总价 -->
          <span class="price-box">总价&nbsp;&nbsp;:&nbsp;&nbsp;¥&nbsp;<span class="price">24</span></span>
          <!-- 结算按钮 -->
          <button class="pay">结算( 6 )</button>
        </div>
      </div>
    </div>
    <!-- 空车 -->
    <div class="empty">🛒空空如也</div>
  </div>
  <script>
    const dataArr = [
      {
        id: 1,
        icon: 'http://autumnfish.cn/static/火龙果.png',
        isChecked: true,
        num: 2,
        price: 6,
      },
      {
        id: 2,
        icon: 'http://autumnfish.cn/static/荔枝.png',
        isChecked: false,
        num: 7,
        price: 20,
      },
      {
        id: 3,
        icon: 'http://autumnfish.cn/static/榴莲.png',
        isChecked: false,
        num: 3,
        price: 40,
      },
      {
        id: 4,
        icon: 'http://autumnfish.cn/static/鸭梨.png',
        isChecked: true,
        num: 10,
        price: 3,
      },
      {
        id: 5,
        icon: 'http://autumnfish.cn/static/樱桃.png',
        isChecked: false,
        num: 20,
        price: 34,
      },
    ]

    const price = document.querySelector('.price')
    const pay = document.querySelector('button.pay')

    function render(arr) {
      const newArr = arr.map(item => `
          <div class="tr">
            <div class="td"><input type="checkbox" ${item.isChecked && 'checked'} data-index="${item.id}"/></div>
            <div class="td"><img src="${item.icon}" alt="" /></div>
            <div class="td">${item.price}</div>
            <div class="td">
              <div class="my-input-number">
                <button class="decrease" data-index="${item.id}"> - </button>
                <span class="my-input">${item.num}</span>
                <button class="increase" data-index="${item.id}"> + </button>
              </div>
            </div>
            <div class="td">${item.price * item.num}</div>
            <div class="td"><button class="del" data-index="${item.id}">删除</button></div>
          </div> 
      `)
      document.querySelector('.tbody').innerHTML = newArr.join('')
      const checks = arr.filter(item => item.isChecked)
      price.innerHTML = checks.reduce((total, item) => total + item.price * item.num, 0)
      pay.innerHTML = `结算( ${checks.length} )`
    }

    render(dataArr)

    const checkAll = document.querySelector('.check-all input')
    // const cks = document.querySelectorAll('.tbody input[type="checkbox"]')
    const tbody = document.querySelector('.tbody')

    checkAll.addEventListener('change', function () {
      // cks.forEach(item => item.checked = this.checked)
      dataArr.forEach(item => item.isChecked = this.checked)
      render(dataArr)
    })

    // cks.forEach(item => {
    //   item.addEventListener('change', function (e) {
    //     // const index = dataArr.findIndex(item => item.id == e.target.dataset.index)
    //     // console.log(index)
    //     // dataArr[index].isChecked = this.checked
    //     checkAll.checked = Array.from(cks).every(item => item.checked)
    //     console.log(Array.from(cks).every(item => item.checked))
    //     // render(dataArr)
    //   })
    // })

    tbody.addEventListener('click', e => {
      const index = dataArr.findIndex(item => item.id == e.target.dataset.index)
      if (e.target.classList.contains('decrease')) {
        dataArr[index].num--
        dataArr[index].num < 1 && (dataArr[index].num = 1)
        render(dataArr)
      } else if (e.target.classList.contains('increase')) {
        dataArr[index].num++
        render(dataArr)
      } else if (e.target.classList.contains('del')) {
        dataArr.splice(index, 1)
        render(dataArr)
      } else if (e.target.localName === 'input') {
        const cks = document.querySelectorAll('.tbody input[type="checkbox"]')
        checkAll.checked = Array.from(cks).every(item => item.checked)
        dataArr[index].isChecked = e.target.checked
        render(dataArr)
      }
    })
  </script>
</body>

</html>